Electrode alignment and assembling device

ABSTRACT

A device for assembling and aligning the electrode planes of a multibeam electron gun structure for an electron discharge device, such as a high resolution cathode ray tube which utilizes a defined array of collimated electron beams provided by the multibeam single gun structure. The device facilitates aligning a planar arrangement of separate control electrode members, forming an aperture array, with at least one accelerating-collimating electrode plane having a similar array of apertures. The accelerating-collimating electrode so oriented in spaced and substantially parallel relationship with the control grid plane provides a collimated array of beams directed to impinge the cathodoluminescent screen in a defined pattern array.

United States Patent 3,159,904 12/1964 Smart ..29/25.l9

Say Nov. 7, 1972 [54] ELECTRODE ALIGNMENT AND Primary Examiner-John F. Campbell ASSEMBLING DEVICE Assistant Examiner--Richard Bernard Lazarus [72] Inventor: Donald L. say Seneca Falls N Y Attorney--Norman J. OMalley, Donald R. Castle and Frederick H. Rinn [73] Assignee: GTE Sylvania Incorporated [22] Filed: May 5, 1971 [57] ABSTRACT A device for assembling and aligning the electrode [21] Appl' 140526 planes of a multibeam electron gun structure for an electron discharge device, such as a high resolution 2 Related Apphcanon Dam cathode ray tube which utilizes a defined array of col- [63] Continuation-impart of Ser. No. 860,625, Sept. limated electron beams provided by the multibeam 24, 1969, abandoned. single gun structure. The device facilitates aligning a planar arrangement of separate control electrode [52] U.S. Cl. ..29/25.19 embers, forming an aperture array, with at ea ne [51] Int. Cl. ..H0lj 9/06, I-lOlj 9/10, H01 j 9/46 aeeelerating-eellimating electrode Plane having a [58] Field of Search ..29/25.19, 25.2; 269/37, 45 similar array of eperwres- The accelerating-collimating electrode so oriented in spaced and substantially [56] References Cited parallel relationship with the control grid plane pro- I vides a collimated array of beams directed to impinge UNITED STATES PATENTS thecathodoluminescent screen in a defined pattern array.

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ATTORNEY ELECTRODE ALIGNMENT AND ASSEMBLING DEVICE CROSS-REFERENCE TO RELATED APPLICATIONS BACKGROUND OF THE INVENTION This invention relates to a device utilized in fabricating a multibeam cathode ray tube and more particularly to an alignment device used in fabricating a single multibeam electron gun structure for cathode ray tube usage.

In certaintypes of high resolution cathode ray tube displays such as may be used in alpha-numeric graphing or mapping presentations, it has beenfound advantageous frOmth'e standpoint of achieving improved brightness, enhanced resolution and increased writing speed, to utilize a multibeam tube having a plurality of substantially parallel and separately modulated electron beams therein. The disadvantages of a single beam system is that display brightness is low due to sweep speeds and time sharing of the beam. It has been found that the use of a plurality of individual electron guns within a common envelope is limited by the size of the respective guns and the internal dimension of the tube neck portion wherein the guns are positioned.

Some known single gunmultibeam tubes comprise intricate electron gun assemblies including electrodes having ceramic substrates and wire formed structures.

OBJECTS AND SUMMARY OF THE INVENTION It is an object of the invention to reduce theaforementioned disadvantages and to provide an alignment device for assembling an improved high resolution multibeam cathode ray tube gun structure. Another object is to provide an improved device for assembling a multibeam electron gun structure wherein the electron beams are substantially parallel and individually modulated. A further object is to provide an improved assembling'device for a multibeam gun structure that can be expeditiously utilized.

The foregoing objects are achieved in one aspect of the invention by providing an improved alignment device for assembling a multibeam single electron gun for an electron discharge device, such as a high resolution cathode ray tube, wherein the multibeam gun structure comprises a plurality of substantially parallel electrode planes. The device having two sets of electrode holding pins thereon facilitates aligning an array of apertures in a planar arrangement of separate control electrode members with at least one plural-apertured metallic planar electrode member havIng a similar aperture array positioned in spaced and parallel relationship with the control electrode array. Lateral movement of the holding pins in the device aligns the several electrode planes to provide collimated beams which are directed to impinge the cathodoluminescent screen-of the tube in an array pattern as determinedby the array of beam apertures in'the multibeam electron gun structure.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a partially cut-away perspective illustrating a cathode ray tube incorporating the invention;

FIG. 2 is a enlarged plan view of the control electrode plane showing the plurality of control electrode members;

FIG. 3 is an enlarged plan view of a plural-apertured planar electrode member;

FIG. 4 is an exploded view illustrating one embodiment of the multibeam electron gun structure;

FIGS. 50, 5b and 5c are perspective views showing pertinent aspects of several embodiments of electrode alignment devices utilized to fabricate the multibeam gun structure assembly;

FIGS. 6 and 7 are side views showing two embodiments of multibeam gun structures during assembly;

FIG. 8 is a perspective view illustrating additional details of multibeam gun assembly; and

FIG. 9 is an enlarged partial cut-away illustration detailing electron beam formation in one embOdiment of the multibeam gun structure.

BRIEF DESCRIPTION OF THE PREFERRED EMBODIMENTS For a better understanding of the present invention, together with other and further objects, advantages and capabilities thereof, reference is made to the following specification and appended claims in connection with the aforedescribed drawings.-

With reference to FIG. 1, there is shown a cathode ray tube 11 having an axis 12 therethrough and an envelope 13 including a face panel or viewing portion 15, a funnel potion 17, and a neck portion 19. Suitably disposed on the inner surface of the face panel 15 is a cathodoluminescent screen 21 comprising at least one electron excitable phosphor material 23. Oriented within the tube neck portion 19 is a multibeam single electron gun structure 25, the componental parts of which are not detailed in FIG. 1. This single gun structure 25 is fabricated to produce a beam pattern array 26 of a defined plurality of similar substantially collimated electron beams 27 which are directed to impinge the screen 21. By way of example, a discrete pattern array 26 comprised of six beams 27 is shown, but such member of beams is not intended to be limiting as the single multibeam gun 25 can be constructed to produce few or many substantially collimated beams 27. In the beam pattern array 26 thus formed, each beam 27 can 7 be separately modulated without need for convergence the low potential of the final electrode of the gun 25 to the internal conductive coating 31 disposed on the interior surface of the funnelportion 17, thus making connection with the high potential of the screen 21. In this way the resistive helix 29 serves to build a long gradual accelerating field which in conjunction with magneticlensing effects faithful imaging of the beam patternarray 26 on the screen 21. I

The plural beam pattern array 26 has an object height (h') and width (w), not shown, as it leaves the electron gun 25 and an image height (h") and width (w") when it impinges the screen 21. In certain display applications it is desired to. effect magnification, demagnification or substantially maintain the image height (h") andwidth (w") relative to the object height (h') and width (w'). Suchis effected by gun structure-and magnetic lensing as will be described later in this specification.

Toensure that the beam pattern array 26 impinges the screen 21in desired rotational alignment, a pattern rotation coil 33 is usually exteriorly positioned on the neck portion 19 'of the tube 11 near the low voltage end of the helix 29. Thus, by adjustment of the pattern rotation coil 33 rotational shifting of the beam pattern array 26 is provided as, for example, in writing italics in a character generating application. In utilizing magnetic focusing and deflection, a focusing coil 35 is mounted on the exterior of the tube neck portion 19 at the high voltage end of the helix 25, and a deflection coil 37 is formed to encompass the envelope transition region 18 where the funnel portion 17 joins the neck portion 19.

Thesingle electron gun structure 25 has a number of electrical connections, not shown, which are brought out through the tube base 39-to external connective means 41,'several of which are shown.

In detailing one embodiment of a multibeam single gun structure 45, particular reference is made to FIGS. '1, 2, 3,and 4'wherein the defined gun structure comprises a common'electron emission plane and an assembly of related parallel conductive electrode planes each having an array of beam apertures therein corresponding to the number and patterned configuration 26 of the desired array of beams 27 impinged upon screen 21.

To provide greater detail and clarity, an exploded viewof the gun structure 45, during construction, is shown inFIG. 4. A source of electrons such as thermionic electron emission means 47 as, for example, a tubular cathode having electron emissive material tially parallel rows of beamapertures 57. To achieve array compactness, the electrode members 53 present a staggered aperture array 61 having a height (h) and a width (w). These dimensions are substantially the same as object height (h') and width (w) of the aforementioned beam pattern array 26 as it leaves the electron gun. Spaced from either side of the aperture array 61 is disposed on at least part of one surface thereof forms a common emission plane 49. Spaced from and parallel with the emission plane 49, and substantially normal to the axis 12, is a metallic substantially planar control electrode mat 51 which is further detailed in FIG. 2. This control electrode mat 51 is discretely formed, as for example, by chemical milling, to provide a framing member 52 encompassing a pluralitY of substantially strip-like self-supporting control electrode members 53 each having a beam aperture 57 therein and a separate electrical connection 59. The several electrode mem bers 53 are positioned in laterally spaced relationship with one another to form a substantially centrally oriented planar control electrode aperture array 61. As shown, the aperture array 61 comprises two substana set of similarly oriented control electrode affixal perforations 63 and 65; and further spaced therefrom, in each of the two opposed extremital portions 67 and 69 of the control electrode mat 51, is a set of similarly located control electrode alignment perforations 71 and 73. Protruding laterally from the control electrode framing member 52 are two sets of control electrode tabs 75 and 77 which are utilize: in gun structure assembly 45.

Spaced from and substantially parallel with said plurality of control electrode members 53 is at least one plural-apertured metallic planar electrode mat 79, forming an accelerating-collimating electrode plane, which is further detailed in FIG. 3. The spacing betweenthe plurality of control electrode members 53 and the accelerating-collimating electrode plane 79is an insulative electrode spacer means 81 in the form of a substantially rectangular-shaped member having a peripheral spacing framing member 83 defining a cen-- array 91 which corresponds in array configuration and,

number with the respective beam apertures 57 in the control electrode-array 61, having substantially similar height (h) and width-(w) dimensions. Spaced on either side of the planar electrode aperture array 91 is a set of similarly oriented planar electrode affixal perforations 93 and 95. In each of the two opposed extremital portions 97 and 99 of the planar electrode mat 79 is a set of two or more similarly located planar electrode alignment perforations 101 and 103. Protruding laterally from the accelerating-collimating planar electrode mat 79 are two sets of planar electrode tabs 105 and 107 which are utilized in gun structure assembly 45.

It has been found that in small size plural beam arrays enhanced focusing and collimation can be achieved by incorporating additional plural-apertured electrode planes to the gun structure. For example in referring to FIG. 4, additional accelerating-collimating electrode planar mats G-3 and 64, forming additional lens planes, are designated as 79' and 79" respectively, and are not specifically detailed as they are substantially the same as aforedescribed planar electrode mat 79. The insulative electrode spacer means 82 and 82' are rectangular framing means having greater thickness than insulative electrode spacer means 81, otherwise they are substantially similar to what has been described.

Cathode shielding means 109 having corner oriented affixal perforations 1 1 1 and protruding tabs 1 13 is positioned in spaced relationship with and substantially parallel to the control electrode mat 51, being discretely spaced therefrom by insulative spacing means 115 which has a plurality of aflixal perforations 1 17 therein. The resultant spacing between the shielding means 109 and the control electrOde mat 51 accommodates the spaced positioning of the cathode 47 therebetween. The several related planar electrode mats and respective spacers are joined together in a compact gun structure assembly 45 by affixal means such as cement, rodlike clamping means or bolts. For example, a plurality of threaded bolts 119, extendingthrough the numerous affixal perforations and insulative washers 121, are suitably secured by nuts 123. By this arrangement the related plurality of apertures in the several respective electrode mats are axially aligned in a manner substantially parallel to the axis 12. A perforated wafer-like insulative spacer 125 positioned on either side of the gun structure assembly has a cathode'aperture 127 therein to accommodate and orient the cathode 47 relative to the control electrode mat 51; the planes of said waferlike spacers 125 being substantially parallel with the axis 12. Sets of perforations 129 and 131 are also contained in the wafer-like spacers 125 to accommodate the shielding means protruding tabs 1 l3 and the several tabs 75, 77,- 105, and 107 protruding from electrode mats 51 and 79, respectively.

Expeditious assembling of the multibeam electron gun structure 45 is accomplished by utilizinG one of the several embodiments of an electrode alignment device as illustrated in FIGS. 5a, 5b, 5c, 6 and 7. For example, the alignment device embodiment 133, as shown in FIG. 5a, is comprised of several parts, one of which is a base portion 135. A cap portion 137 is shaped for fixed attachment to the base portion 135, as for example by bolt means 136 which seat in the base 135 to form a cap-base assembly 138 wherein there is provided longitudinal guide channel means in the form of spaced apart channels 139. The cap portion has an upper surface 141 whereof the leading edge portion 143 has a, plurality of vertical pins 145 oriented adjacent thereto. The pins 145 are spaced in a manner to match superjacent sets of the respective electrode mat alignment perforations, for example 73 and 103. A slide portion 147 has a longitudinal member means in the form of a pair of spaced apart legs 149 oriented to slide in the spaced apart guide channels 139 in the capbase aSsembly 138. The space 150 provided therebetween is advantageously utilized during affixation of the gun structure assembly, as it facilitates insertion of the clamping bolts 119 through the assembled electrode mats. The slide portion 147 has a bridge member 151 formed substantially normal to the longitudinal member means 149. The bridge member 151 has an upper surface 153 with a forward edge portion 155 oriented in adjustably spaced relationship to the cap portion leading edge portion 143. Adjacent to the forward edge portion 155 are a plurality of vertical pins 157 oriented in a manner to match opposed superjacent sets of electrode mat alignment perforations, for example 71 and 101. The respective sets of pins 145 and 157, which are oriented in a common lateral plane, have sufficient vertical length to accommodate a plurality of planar electrode mats in spaced apart stacked arrangement. In this embodiment, lateral movement means 159 is in the form of a separate motion adjustment for each of the related legs and is incorporated in the cap-base assembly 138 to provide lateral uniform adjustable movement to each segment of the longitudinal member means 149 to thereby effect controlled movement of the two respective pluralities of pins 145 and 157 and provide lateral tautness and alignment to the electrode mats accommodated thereon.

In assembling a multibeam single gun electron gun structure of the type described, an electrode assembly is first fabricated. With reference to FIGS. 5a and 6, there is shown one embodiment of an electrode assembly 161 comprising a control electrode mat 51 and a planar electrode mat 79. Such is facilely assembled by positioning an accelerating-collimating electrode mat 79 on the alignment device 133 with the opposed sets of alignment perforations 101 and 103 mating with the corresponding sets of vertical pins 157 and 145 on the device. An insulative electrode spacer means 81 is positioned upon the accelerating-collimating electrode mat 79 with the respective affixal perforations substantially aligned. A control electrode mat 51 is positioned atop the spacer means 81 on the device 133 with the opposed alignment perforations 71 and 73 mating with the sets of pins 157 and 145 thereon. Alignment of the respective beam apertures in the'two electrode mats 79 and 51, is accomplished by discretely activating each of the two screw-type motion adjustment means 158 forming the lateral movement means 159 in the device 133 to carefully move the sets of pins 157 and 145 and provide lateral tautness to the mats. Care is exercised to avoid deformation of the respective alignment perforations. Insulative spacing means are placed atop the control electrode mat 51 with the respective affixal perforations in alignment; whereupon the cathode shielding means 109 is suitably positioned. With the componental elements thus arranged, affixation is effected to form a unified electrode assembly 161. As previously mentioned, affixation is accomplished in several ways, as for example, by applying a suitable ceramic bonding material to the region of the affixal perforations, or by inserting rod-like clamping means, such as bolts, through the aligned affixal perforations. As shown, bolts 119 are utilized, being inserted up through the assembly with the insulative washers 121 and mating nuts 123 applied adjacent to the cathode shielding means 109. If ceramic bonding material is utilized for affixation, the electrode assembly 161 is retained in the device 133 until the bonding is set. Being thus assembled and suitably affixed, the electrode assembly 161 is removed from the alignment device 133 and placed in a sealed enclosure, not

shown, for outgassing which is accomplished by a com ventional heating and exhaust procedure.

With reference to FIG. 5b, there is illustrated another embodiment of an electrode alignment device 233 comprised of several related parts. The cap portion 237 is shaped for attachment to the base portion 235 to form a second embodiment cap-base assembly wherein there is provided a single longitudinal guide channel 239. This second embodiment likewise has a plurality of vertical pins 245 oriented adjacent the leading edge portion 243 of the top cap portion 237. Compatible with the cap-base assembly is a slide portion 247 comprising a bridge member 251 having integral therewith a longitudinal member means configurated as a substantially "Y-shaped" member 249 having dual and single projecting elements252 and 253, respectively. The

modate the electrode alignment perforations 71 and 101 as previously described. Lateral movement for this particular device embodiment 233. is effected by movement means 259 which, in this instance, is in the form of a rotatable longitudinal threaded member 258 which is extended through an opening 261 in the base assembly 235 in a manner to mate with a tapped bore 263 in the end of the single projecting element 253 of the slide portion 247. Resilient means, such as a compression spring 265, is oriented on threaded member 258, being positioned between the forward face 267 of the single projecting element 253 and the related surface 269 in thebase portion 235 to provide smoothness for the alignment operation by counteracting possible slackness of the projecting element 253 in the guide channel 239. This second embodiment of an electrode alignment device 233 is utilized in assembling a multibeam electron gun structure of the type as aforedescribed.

Another or third embodiment of an electrode alignment device 333 is partially shown in FIG. 50. In general, it exhibits certain constructional features that are similar to those described in the second embodiment 233. Basically, the third embodiment 333 comprises a base portion 335 and a cap portion 337 which form a third embodiment cap-base assembly, wherein there is defined a single longitudinal guide channel 339. A Y-shaped member 349 which is a portion of the bridge member, comprises dual and single projecting elements 352 and 353, respectively. The single projecting elements 353is slidable within the guide channel 339. Lateral movement for this third device embodiment 333 is accomplished by movement means 359 which is in the form of a cam member 361 reacting with the single projecting element 353 of the slide portion 349. A cavity to, accommodate movement of the cam member 361 is formed of related superposed slots 369, 371 and 373 in the cap and base portions and the single slide element 337, 335 and 353 respectively. The cam member 361 is mounted on an associated shaft 363, which shaft has the ends thereof oriented in related bores 365 and 367 in base portion 335. An intermediate portion of the shaft, whereon the cam member 361 is oriented, traverses the slot 373 in the single element 353 through a pair of elongated openings 375 and 377 in the opposed-sides thereof. The active surface 379 of the cam member 361 makes sliding contact with an end portion 381 of the slot 373 in the single element 353 which functions as a cam follower to effect desired movement of the slide portion 349. Controlled movement is imparted to the cam member 361 by handle means 383. Resilient means, such as compression 8 spring 384, is positioned on projecting stud member 385 which is oriented to be slidable within bore 387 in the base portion 335. The action of the spring 384 assures loading of the cam and provides smoothness of the operational movement effecting alignment as described for the second embodiment'233.

The fabrication of another structural embodiment of electrode assembly 163 is shown in FIG. 7 wherein additional plural-apertured metallic planar electrode mats 79' and 79" are also included along with the necessary insulative spacer means 82 and 82. The

aforementioned assembling and degassing procedures utilized for the first assembly embodiment 161 also apply equally as well to this second assembly embodiment 163. To simplify description, further consideration is substantially confined to the second assembly embodiment 163.

After degassing, the extremital portions of the several electrode mats, such as 67, 69, and the pluralities of 97, 99 are removed adjacent to the several electrode spacer means 77, 82 and 82. Such removal provides separate lead connections 59 for the individual electrode members 53 of the control electrode plane 51 as illustrated in FIG. 8. A perforated wafer-like insulative, such as a mica or ceramic, spacer is positioned on either side of the electrode assembly 163 with the planes of the spacers 125 being substantially parallel with the axis 12. A thermionic cathode 47 is positioned-cathode apertures 127 of the spacer means 125 in a manner that the emission plane 49 is adjacent the array of control electrode apertures 57; whereupon, the spacers 125 are secured to the respective tabs, for example 75, 77 and 113 as shown in FIG. 8. In this manner, the gun structure 45 is unitized. Separate electrical connections 165, 167 and 169 are provided for planar electrode planes 79, 79, and 79", respectively. A formed heater 171 is positioned within the cathode 47. The gunstructure 45 is positioned relative to a multi-lead stem means, not shown, and secured to support leadsv 173 extending therefrom and attached, for example, to bolt means 119. Electrical connections from the componental parts of the gun structure 45 are made to appropriate stem connective leads in a conventional manner.

To achieve high resolution images with multibeam array, it has been found advantageous, in some instances, to position a field forming mesh forward of, the final electrode plane to provide an additional controlfeature in the region where the beams enter the accelerating helix. A mesh lens so positioned has the advantage of being either convergent or divergent depending on whether it is operated above or below its surroundings. With reference to .FIG. 8, the mesh lens 175, if desired, is positioned in a substantially parallel manner forward of and spaced from the final accelerating-collimating electrode plane 79" and has a separate electrical connection 177. A cylindrical metallic shield 179 operating at the potential of. the final electrode plane 79" encompasses the space between the final I electrode plane and the mesh. In referring to FIGS. 1 and 8, the electron gun structure, in this instance the cylindrical shield 179, has resilient electrical connective means 181 formed to contact a conductive band 183 disposed on the inner. surface of the neck portion 19 and connected to the helix 29.

An additional embodimentv of the multibeam gun structure is illustrated in FIG. 9. wherein another pluralapertured metallic planar electrode mat 79*, which is dimensionally similar to planar electrode mat 79, is positioned between the common electron emissive plane 49 and the control electrode plane 51 to provide shielding effects and a pre-formed beam pattern array which is discretely beamed to the respective control electrode apertures 57. Spacings between the electron emission means 47, the planar electrode plane 79* and the control electrode plane 51 are efiected by spacer means, which for purposes of clarity are not shown.

Thus, there are provided several embodiments of an improved device for aligning and assembling a high resolution multibeam cathode ray tub single gun structure of a type that is expeditiously fabricated by using the described devices.

While there has been shown and described what are at present considered the preferred embodiments of the invention, it will be obviouS to those skilled in the art that various changes and modifications may be made therein without departing from the scope of the invention as defined by the appended claims.

I claim:

1. An electrode alignment device for assembling the related electrodes of a multibeam electron gun structureha'ving therein a substantially planar control electrode mat formed of an array of individual electrode members each having a beam aperture therein and I separate leads therefrom and at least one substantially planar accelerating-collimating electrode mat oriented in stacked spaced apart relationship with said planar control electrode mat and having a plurality of beam apertures corresponding in array in number to the beam apertures in the control electrode array, each of said electrode mats having spaced on either side of said aperture array a set of similarly oriented affixal perforations and a set of alignment perforations located in two opposed extremital portions of said mats, said alignment device comprising: a base portion,

a cap portion shaped for fixed attachment to said base portion to form a cap-base assembly to conjunctively provide longitudinal guide channel means, said cap portion having an upper surface whereof the leading edge has a plurality of vertical pins oriented adjacent thereto in a manner to one set of said electrode mat alignment perforations; slide portion having longitudinal member means formed to slide in said guide channel means, said slide portion having a bridge member substantially normal to said longitudinal member means, said bridge member having an upper surface with a forward edge oriented in adjustably spaced relationship to said cap portion leading edge, said bridge member having a plurality of vertical pins oriented adjacent to said forward edge thereof in a manner to match an opposed set of said electrode mat alignment perforations.

2. An electrode alignment device according to claim 1 wherein said bridge oriented pins and said caP oriented pins are in a common lateral plane, and

wherein said plurality of bridge oriented pins are laterally movable with respect to said plurality of cap oriented pins to provide lateral tautness to said electrode mat 3. An electrode alignment device according to claim 1 wherein said cap-base assembly has movement means provisions therein to provide uniform adjustable movement to said longitudinal member means to effect controlled movement of said two respective pluralities of prns.

4. An electrode alignment device according to claim 1 wherein said pins are of sufficient vertical length to accommodate more than two electrode planes in spaced apart stacked arrangement.

5. An electrode alignment device according to claim 3 wherein said longitudinal member means of said slide portion are in the form of a pair of spaced apart legs slidable within spaced apart longitudinal guide channel means in Said assembly.

6. An electrode alignment device according to claim 5 wherein said movement means is in the form of a separate motion adjustment for each leg.

7. An electrode alignment device according to claim 3 wherein said longitudinal member means of said slide portion is in the form of a substantially Y-shaped member having dual and single projecting elements, the ends of said dual elements being integral with said bridge member and said single projecting element being slidable within compatible longitudinal guide channel means in said assembly.

8. An electrode alignment device according to claim 7 wherein said movement means is in the form of a rotatable longitudinal threaded member extending through an opening in said assembly and mating with a tapped bore in the end of the single projecting element of said slide portion.

9. An electrode alignment device according to claim 7 wherein said movement means is in the form of a cam member reacting with said slide portion, said cam member being mounted on an associated shaft and oriented within a cavity formed of related superposed slots in said single slide element and in said cap and base portions, the end portions of said shaft being oriented within bores in said assembly with the intermediate portion of said shaft traversing the single element slot through a pair of elongated openings in the opposed sides thereof, the active surface of said cam member making-sliding contact with an end portion of said slot in said single element to effect movement of said slide portion.

po-wso UNITE STATES PATENT OFFICE (569) CERTIFICATE OF CORRECTION Patent No. 3 a R I v Dated November 7 1972 Inventor 5 Donald L. Say R R It is certified that error appears in' the above-identified patent and that said Letters Patent are hereby corrected as shown below:

!" f I I In the Claims, Claim 1, Col. 9 line 46 manner to one-should read -"manner to match one" Signed and sealed this 24th day of April 1973.

(SEAL) At'test:

EDWARD M FLETCHER,JR. ROBERT GOTTSCHALK Attesting Officer v Commissioner of'Patents 

1. An electrode alignment device for assembling the related electrodes of a multibeam electron gun structure having therein a substantially planar control electrode mat formed of an array of individual electrode members each having a beam aperture therein and separate leads therefrom and at least one substantially planar accelerating-collimating electrode mat oriented in stacked spaced apart relationship with said planar control electrode mat and having a plurality of beam apertures corresponding in array in number to the beam apertures in the control electrode array, each of said electrode mats having spaced on either side of said aperture array a set of similarly oriented affixal perforations and a set of alignment perforations located in two opposed extremital portions of said mats, said alignment device comprising: a base portion, a cap portion shaped for fixed attachment to said base portion to form a cap-base assembly to conjunctively provide longitudinal guide channel means, said cap portion having an upper surface whereof the leading edge has a plurality of vertical pins oriented adjacent thereto in a manner to one set of said electrode mat alignment perforations; a slide portion having longitudinal member means formed to slide in said guide channel means, said slide portion having a bridge member substantially normal to said longitudinal member means, said bridge member having an upper surface with a forward edge oriented in adjustably spaced relationship to said cap portion leading edge, said bridge member having a plurality of vertical pins oriented adjacent to said forward edge thereof in a manner to match an opposed set of said electrode mat alignment perforations.
 2. An electrode alignment device according to claim 1 wherein said bridge oriented pins and said caP oriented pins are in a common lateral plane, and wherein said plurality of bridge oriented pins are laterally movable with respect to said plurality of cap oriented pins to provide lateral tautness to said electrode mat.
 3. An electrode alignment device according to claim 1 wherein said cap-base assembly has movement means proviSions therein to provide uniform adjustable movement to said longitudinal member means to effect controlled movement of said two respective pluralities of pins.
 4. An electrode alignment device according to claim 1 wherein said pins are of sufficient vertical length to accommodate more than two electrode planes in spaced apart stacked arrangement.
 5. An electrode alignment device according to claim 3 wherein said longitudinal member means of said slide portion are in the form of a pair of spaced apart legs slidable within spaced apart longitudinal guide channel means in Said assembly.
 6. An electrode alignment device according to claim 5 wherein said movement means is in the foRm of a separate motion adjustment for each leg.
 7. An electrode alignment device according to claim 3 wherein said longitudinal member means of said slide portion is in the form of a substantially ''''Y-shaped'''' member having dual and single projecting elements, the ends of said dual elements being integral with said bridge member and said single projecting element being slidable within compatible longitudinal guide channel means in said assembly.
 8. An electrode alignment device according to claim 7 wherein said movement means is in the form of a rotatable longitudinal threaded member extending through an opening in said assembly and mating with a tapped bore in the end of the single projecting element of said slide portion.
 9. An electrode alignment device according to claim 7 wherein said movement means is in the form of a cam member reacting with said slide portion, said cam member being mounted on an associated shaft and oriented within a cavity formed of related superposed slots in said single slide element and in said cap and base portions, the end portions of said shaft being oriented within bores in said assembly with the intermediate portion of said shaft traverSing the single element slot through a pair of elongated openings in the opposed sides thereof, the active surface of said cam member making sliding contact with an end portion of said slot in said single element to effect movement of said slide portion. 